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Notes Payable (Schedule of Long-term Debt) (Details) - USD ($)
$ in Thousands
Nov. 18, 2022
Dec. 31, 2022
Dec. 31, 2021
Mar. 08, 2017
Debt Instrument [Line Items]        
Total principal amount   $ 400,000 $ 375,000  
Unamortized discount and debt issuance costs   1,670 2,069  
Total   398,330 372,931  
Unsecured notes        
Debt Instrument [Line Items]        
Total   373,330 372,931  
Unsecured notes | Unsecured Notes One        
Debt Instrument [Line Items]        
Interest rate, stated percentage       4.40%
Notes payable | Unsecured notes | Unsecured Notes One        
Debt Instrument [Line Items]        
Unsecured debt   $ 375,000 375,000 $ 375,000
Interest rate, stated percentage   4.40%    
Notes payable | Unsecured notes | Unsecured Notes Two        
Debt Instrument [Line Items]        
Unsecured debt   $ 25,000 $ 0  
Notes payable | Unsecured notes | Unsecured Notes Two | Minimum | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate        
Debt Instrument [Line Items]        
Basis spread on variable rate 1.125%      
Notes payable | Unsecured notes | Unsecured Notes Two | Maximum | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate        
Debt Instrument [Line Items]        
Basis spread on variable rate 1.50%